# Edge2 Fan

Fan Control Instructions for SBC Android System

## Control Nodes

1. **'/sys/class/fan/enable'**  
   Controls the fan power state.  
   - Write '0' to turn the fan off.  
   - Write '1' to turn the fan on.

2. **'/sys/class/fan/mode'**  
   Controls the fan operation mode.  
   - Write '0' for manual control mode.  
   - Write '1' for automatic control mode (the fan speed adjusts automatically based on the SoC temperature).

3. **'/sys/class/fan/level'**  
   Controls the fan speed in manual mode. Range: '1' to '5'.  
   - Write '1' for the minimum fan speed.  
   - Write '5' for the maximum fan speed.


## Examples

Turn the fan off

```shell
$ echo 0 > /sys/class/fan/enable
```

Set the fan to automatic mode
```shell
$ echo 1 > /sys/class/fan/enable
$ echo 1 > /sys/class/fan/mode
```

Set the fan to minimum speed (manual mode)
```shell
$ echo 1 > /sys/class/fan/enable
$ echo 0 > /sys/class/fan/mode
$ echo 1 > /sys/class/fan/level
```

Set the fan to maximum speed (manual mode)
```shell
$ echo 1 > /sys/class/fan/enable
$ echo 0 > /sys/class/fan/mode
$ echo 5 > /sys/class/fan/level
```